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An abnormal heart rhythm is when your heart beats too fast, slow, or irregularly. This is also called an arrhythmia. Within the heart is a complex system of valves, nodes, and chambers that control how and when the blood is pumped. An abnormal heart rhythm is when your heart beats too fast, slow, or irregularly.
You may not notice them, or you may feel a fluttering in your chest. The high-energy pulses or shocks your ICD gives last only a fraction of a second. They may feel like thumping or a painful kick in the chest, depending on their strength. Your doctor may give you medicine to decrease the number of irregular heartbeats you have.